The word "hour" is a measure of time, equal to 60 minutes. It is often abbreviated as "hr."
The word "hour" can also be used to refer to a specific time of day, such as "the sixth hour" (6:00 AM or PM) or "the evening hour" (5:00 PM).
In addition, the word "hour" can be used to refer to a period of time, such as "a two-hour movie" or "a 40-hour work week."
Finally, the word "hour" can be used in a figurative sense, such as "the hour of need" or "the eleventh hour."